?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F573%2F&rft.title=Interfacial+Behaviour+in+Tunnel+Engineering&rft.creator=Bohun%2C+C.+S.&rft.subject=Transport+and+Automotive&rft.subject=Machines+%2F+Production&rft.description=The+stress+induced+in+an+underground+tunnel+due+to+the+applied+stress+of+a+tunnel+boring+machine+(TBM)+is+studied+to+understand+the+mechanisms+which+lead+to+tunnel+collapse.+An+investigation+of+the+classical+plane+strain+gravitational+problem+in+a+purely+elastic+medium+shows+that+any+fractures+due+to+gravitational+effects+alone+would+occur+at+the+base+of+the+tunnel+rather+than+the+apex.+Ignoring+gravity+we+then+explore+an+elastic%2Fplastic+solution+in+an+idealized+soil+with+no+cohesion.+To+simulate+the+action+of+the+TBM+a+point+source+is+imparted+on+the+medium+extending+in+the+horizontal+direction.+This+model+decouples+into+an+elastostatic+problem+that+predicts+a+wedge+shaped+region+of+plasticity+extending+from+the+point+source+and+a+hyperbolic+flow+problem+in+the+plasticized+region.+Using+a+similarity+solution%2C+it+is+shown+that+the+behaviour+of+the+medium+is+very+sensitive+to+the+parameters+that+characterize+the+soil.&rft.date=2008&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F573%2F1%2F6.pdf&rft.identifier=++Bohun%2C+C.+S.++(2008)+Interfacial+Behaviour+in+Tunnel+Engineering.++%5BStudy+Group+Report%5D+++++